SxS:
Much depends on the type and age of the gun in question. But, in general, yes. Both tubes should be within a couple of thousandths of the same spec. But remember... you a talking about a shotgun. It is intended to throw a cloud of pellets. and the charge expands to fill the bore on its way out - which is the principle of back boring. A little "tolerance" is not going to matter.
In the final analysis, the more metal you have in a SxS shotgun tube, the better. General rule. So... if one tube is thicker than the other, be grateful. And yes, it could well be the result of responsible honing that took out only as much metal as needed.
Bottom line: Don't let any of this worry you.
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